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In mathematics, Ostrowski numeration, named after Alexander Ostrowski, is either of two related numeration systems based on continued fractions: a non-standard positional numeral system for integers and a non-integer representation of real numbers. Fix a positive irrational number ''α'' with continued fraction expansion (). Let (''q''''n'') be the sequence of denominators of the convergents ''p''''n''/''q''''n'' to α: so ''q''''n'' = ''a''''n''''q''''n''−1 + ''q''''n''−2. Let ''α''''n'' denote ''T''''n''(''α'') where ''T'' is the Gauss map ''T''(''x'') = , and write ''β''''n'' = (−1)''n''+1 ''α''0α1 ... ''α''''n'': we have ''β''''n'' = ''a''''n''''β''''n''−1 + ''β''''n''−2. ==Real number representations== Every positive real ''x'' can be written as : where the integer coefficients 0 ≤ ''b''''n'' ≤ ''a''''n'' and if ''b''''n'' = ''a''''n'' then ''b''''n''−1 = 0. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Ostrowski numeration」の詳細全文を読む スポンサード リンク
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